Two big reasons why Broken Social Scene was the best show I saw at Lollapalooza:

1. The entire band was there: all 17 members! (including the members of Feist, Stars, and Metric)

2. They played “Anthems for a Seventeen Year-Old Girl” - possibly the grooviest song ever invented - and oh did Chicago quiver.

Other shows I caught and thought were terrific include:
Iron & Wine
Death Cab for Cutie
Oh No! Oh My!
Andrew Bird
and a band from Louisiana called Mute Math, which I'd never heard before, but boy did they bring the rock. At one point the bass player put a towel over the drummer’s face and poured bottled water all over the drum kit and the drummer kept thrashing and it made this horribly disturbing, yet somehow aesthetically pleasing noise, while the water splashed everywhere. Oh, and they played a homemade Theremin as well as other strange gadgets. Gnarls Barkley was fun. They dressed up in tennis outfits. A huge banner behind them showed a revolver with a heart shaped smoke ring coming out of the barrel.

Pictures and art to come.